Does your birth control make you miss periods?

So, I take a low dose birth control. Last month I was really stressed, had a change in diet, and started a new job. I had a tiny bit of blood two days before I started the sugar pills in my pack, and none after that. I still had all my normal symptoms though- moodiness, cravings, bloating, acne, cramps, and mild headaches which stopped after a few days as normal. Essentially, I had a period with everything except the blood. I got a new pack of pills and began taking them, and now, same problem. I took my first sugar pill last night. So far there has been only one minuscule drop of blood on my pads. I got acne, cramps, I got emotional, I had cravings and bloating and mild headaches. Still no blood. Over the last month and a half months I have taken two pregnancy tests (two different brands, two different packages, three weeks apart) and all said not pregnant. I had unprotected sex once but he didn't finish or get even close and I haven't missed any pills so I really honestly don't think I am pregnant. I also believe I had a miscarriage 2 1/2 months ago but I wouldn't have been very far along at all if I did. It was about 2 1/2 straight weeks of really heavy bleeding. And I do still have three more days until I can call this a second missed period. I just want to know if anyone else on birth control has experienced all of their symptoms but a lack of blood?